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Study of Anatase TiO2 in the Presence of N2 under Shock Dynamic Loading in a Free Piston Driven Shock Tube

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Study of Anatase TiO2 in the Presence of N2 under Shock Dynamic Loading in a Free Piston Driven Shock Tube


Topics
Shock Dynamic Loading, High-enthalpy Gas, Solar Eenergy Materials, Phase Transformation, N-Doped TiO2
Collection
folkscanomy_academic; folkscanomy; additional_collections
Language
English
Item Size
13.0M
Free Piston Driven Shock Tube [FPST] is used to heat Ar and 
N2 gas mixture to extremely high temperature like 9100 –
12300 K with reflected shock pressure of about 59-70 bar for 
about 2-4 ms duration. Shock heated nitrogen gas under this 
extreme temperature goes to both non-equilibrium and 
dissociation state. Here argon promotes heating of N2  to 
higher temperature. At this extreme thermodynamic 
condition shock heated nitrogen gas interacts with the 
anatase TiO2  at the end of the shock tube. The surface 
composition, electronic structure, crystal structure and 
surface morphology of the anatase TiO2  sample was 
examined before and after shock loading using X-ray 
photoelectron spectroscopy (XPS), X-ray diffraction (XRD), 
Scanning electron microscopy (SEM) and High-resolution 
transmission electron microscopy (HRTEM). The results 
obtained from the experimental investigations shows the 
formation of N doped rutile TiO2-xNx. After shock treatment 
colour of the top surface of white anatase TiO2 change to 
yellow colour indicating nitrogen doping. Under this 
temperature anatase TiO2 is subjected to super heating and 
cooling in presence of high enthalpy nitrogen and helps to 
stabilize the N doped rutile TiO2  structure. In this short 
duration, crystallographic phase transformation occurs from 
anatase TiO2  to N doped rutile TiO2. An extreme 
thermodynamic condition prevalent at the end of the shock 
tube makes FPST an important tool for the exploration to 
study polymorphic phase transformation of ceramic 
materials, materials modification and synthesis of new 
materials.
Addeddate
2013-12-27 06:06:13
Collection_added
folkscanomy
additional_collections
Identifier
ACSE10026
Identifier-ark
ark:/13960/t0jt23v45
Ocr
ABBYY FineReader 9.0
Pages
7
Ppi
600
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